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Room Temperature Curable Copper Nanowire-Based Transparent Heater.

Darbha V Ravi Kumar1, Aarju Mathew Koshy2, Neha Sharma2

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We developed an annealing-free transparent conducting film (TCF) using copper nanowires (Cu NWs). This cost-effective TCF offers excellent conductivity and transparency, paving the way for advanced optoelectronics.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Silver nanowires (Ag NWs) are widely used for transparent conducting films (TCFs), but their high cost and limited abundance are drawbacks.
  • Copper nanowires (Cu NWs) offer comparable conductivity and are more abundant, but challenges remain in processing and stability for commercial use.
  • Existing methods for Cu NW TCFs often require high-temperature annealing and complex post-synthesis modifications, hindering scalability.

Purpose of the Study:

  • To develop a cost-effective, annealing-free transparent conducting film (TCF) using copper nanowires (Cu NWs).
  • To minimize post-synthetic modifications and high-temperature processing for Cu NW TCFs.
  • To demonstrate the potential of Cu NW TCFs as a viable alternative to Ag NW TCFs in optoelectronic applications.

Main Methods:

  • Developed a room-temperature curable Cu NW ink using organic acid pretreatment.
  • Fabricated TCFs via spin-coating the pretreated Cu NW ink.
  • Encapsulated the Cu NW TCF with polydimethylsiloxane (PDMS) for oxidation protection.

Main Results:

  • Achieved a TCF with a sheet resistance of 9.4 Ω/sq. and 67.4% optical transparency at 550 nm.
  • The developed TCF requires no high-temperature annealing or extensive post-processing.
  • The encapsulated Cu NW TCF demonstrated good repeatability as a transparent heater.

Conclusions:

  • The annealing-free Cu NW TCF presents a promising, low-cost alternative to Ag NW TCFs.
  • The developed fabrication method simplifies processing, enabling potential commercial deployment.
  • Cu NW TCFs show potential for various optoelectronic devices, including transparent heaters, touch screens, and photovoltaics.